<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>

   var nameInfo = [
       ['c','h','e','n'],
       '俊'
   ];
    var age = 30;
    var user = ['frank',age,nameInfo];
    console.log(user);
//   user[2];
//
console.log("***************");
    var u = [
        'frank',
        30,
        ['陈','俊']
    ];
    console.log(u[2])
    for (var i in u[2]){
        console.log(i);
        console.log(u[2][i]);
    }
</script>
</body>
</html>